Malicious PDF — malware analysis report

Static analysis result for SHA-256 84103be770a5c410…

MALICIOUS

PDF

70.4 KB Created: 2021-09-16 20:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41530c531dbb38642c383ee63bb4ab86 SHA-1: 4aa5673be6d4c6f59495e02aff2f05d56d55d7db SHA-256: 84103be770a5c4109d0bff6c75378a1bec3b464fceebe0207c844fc4755109ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=naruto+shippuden+367 PDF link annotation
    • http://fijiembajak.com/uploads/ck_uploads/files/pozidu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130fdf509e5e---5748078264.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/472f0f3ccda55d4891747453eecc48f7/60252513614.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/3901242085.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/tezitefageze.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/fomamonu.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/20325568315.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/65944379236.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/13970803798.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/72084990301.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/fudelidibosesamotix.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/94828513506.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/42890337156.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/8c1a580e2597df4f6b9e891133b7c294/66227050180.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/tipubodobadoxoduletajuv.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/seworedikemobabelirebok.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijivetijoderor.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/seluguwofomokenurodov.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce078abb96---pivode.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/41910560072.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/farasidajonipasinew.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/gatorejemovomazawoz.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/72789870407.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB5 10912 bytes
SHA-256: 37e9a7a0552a6e779ad17891b9f3a984b6d86f724f7042a8e4c87c5708dce72f
font_01_sfnt_off0000c905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 16952 bytes
SHA-256: 9ff932e794d7e6c2c651d63ffe3ff6561d1e37b4ae54b574bece7450370be42a